反应详情

In the manner described in Example 54, 4-methyl-2-oxopentanoic acid and L-histidyl-L-leucine are condensed in the presence of sodium cyanoborohydride to yield N-(1-carboxy-3-methylbutyl)-L-histidyl-L-leucine. In this case the product is eluted from the ion exchange resin with 10% ammonia. The mass spectrum shows a molecular ion at 408 m/e for the disilylated species minus 18. The nmr spectrum is consistent with structure.